Apparatus

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sensors Mode-S transponder

AB6542

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N833UA · AIRBUS A-319 · operated by UNITED AIRLINES INC

Hex
AB6542
Octal
52662502
Decimal
11,232,578
Country
US
Tail
N833UA
Type
A319
No current signal · last broadcast 14d ago
Flights observed
330
Distinct callsigns
20
Country
US
Last broadcast
14d ago

Last known position

Most recent position reported by Mode-S AB6542.

Country allocation

The ICAO 24-bit address AB6542 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
UAL581 United Airlines 8 2026-06-09
UAL1874 United Airlines 8 2026-06-11
UAL568 United Airlines 7 2026-06-11
UAL1235 United Airlines 7 2026-06-13
UAL1836 United Airlines 6 2026-06-02
UAL2218 United Airlines 5 2026-04-25
UAL2154 - 5 2026-06-13
UAL1913 United Airlines 5 2026-06-12
UAL1833 United Airlines 5 2026-05-08
UAL2691 United Airlines 4 2026-05-08
UAL2345 United Airlines 4 2026-05-07
UAL1492 United Airlines 4 2026-06-09
UAL1287 - 4 2026-06-19
UAL792 United Airlines 3 2026-05-20
UAL724 United Airlines 3 2026-04-17
UAL543 - 3 2026-06-13
UAL466 United Airlines 3 2026-06-09
UAL439 United Airlines 3 2026-06-10
UAL333 United Airlines 3 2026-04-17
UAL2822 United Airlines 3 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-29 UAL3875 - Jun 29, 15:24 UTCJun 29, 17:10 UTC1h 45m
2026-06-21 UAL2272 MSP → DEN Jun 21, 22:10 UTCJun 22, 00:14 UTC2h 5m
2026-06-21 UAL1068 - Jun 21, 18:14 UTCJun 21, 20:54 UTC2h 40m
2026-06-20 UAL1760 IAH → RDU Jun 20, 11:30 UTCJun 20, 14:39 UTC3h 10m
2026-06-20 UAL676 EWR → AUS Jun 20, 00:43 UTCJun 20, 04:18 UTC3h 35m
2026-06-20 UAL676 - Jun 20, 00:49 UTCJun 20, 04:20 UTC3h 30m
2026-06-19 UAL2347 - Jun 19, 18:54 UTCJun 19, 22:30 UTC3h 35m
2026-06-19 UAL2347 SAT → EWR Jun 19, 18:49 UTCJun 19, 22:15 UTC3h 26m
2026-06-19 UAL591 - Jun 19, 13:50 UTCJun 19, 17:19 UTC3h 30m
2026-06-19 UAL299 ATL → EWR Jun 19, 10:24 UTCJun 19, 12:04 UTC1h 40m
2026-06-19 UAL1287 - Jun 19, 01:19 UTCJun 19, 03:15 UTC1h 55m
2026-06-18 UAL8112 - Jun 18, 14:35 UTCJun 18, 16:20 UTC1h 45m
2026-06-18 UAL1428 EWR → BNA Jun 18, 11:20 UTCJun 18, 13:25 UTC2h 5m
2026-06-18 UAL1428 EWR → BNA Jun 18, 11:21 UTCJun 18, 13:25 UTC2h 4m
2026-06-18 UAL2060 BOS → EWR Jun 18, 01:25 UTCJun 18, 02:20 UTC55m
2026-06-17 UAL2107 EWR → BOS Jun 17, 22:28 UTCJun 18, 00:08 UTC1h 40m
2026-06-17 UAL2107 - Jun 17, 23:15 UTCJun 18, 00:10 UTC55m
2026-06-17 UAL1499 AUS → EWR Jun 17, 15:20 UTCJun 17, 18:30 UTC3h 10m
2026-06-17 UAL1229 EWR → MCI Jun 17, 10:15 UTCJun 17, 13:45 UTC3h 30m
2026-06-17 UAL1229 EWR → MCI Jun 17, 10:24 UTCJun 17, 13:48 UTC3h 24m
2026-06-17 UAL2060 BOS → EWR Jun 17, 00:45 UTCJun 17, 01:30 UTC45m
2026-06-16 UAL2107 EWR → BOS Jun 16, 22:15 UTCJun 16, 23:05 UTC50m
2026-06-16 UAL1844 ATL → EWR Jun 16, 19:10 UTCJun 16, 20:50 UTC1h 41m
2026-06-16 UAL2684 PHL → ORD Jun 16, 16:05 UTCJun 16, 17:35 UTC1h 30m
2026-06-16 UAL2684 PHL → ORD Jun 16, 16:01 UTCJun 16, 17:32 UTC1h 31m
2026-06-16 UAL247 DTW → ORD Jun 16, 12:35 UTCJun 16, 14:15 UTC1h 40m
2026-06-16 UAL2130 DEN → MEM Jun 16, 00:13 UTCJun 16, 01:54 UTC1h 41m
2026-06-16 UAL2130 - Jun 16, 00:20 UTCJun 16, 01:55 UTC1h 35m
2026-06-15 UAL1268 LGA → IAH Jun 15, 04:10 UTCJun 15, 06:40 UTC2h 30m
2026-06-15 UAL1608 MSN → DEN Jun 15, 00:45 UTCJun 15, 02:44 UTC2h 0m
2026-06-14 UAL3938 SEA → SFO Jun 14, 13:30 UTCJun 14, 17:15 UTC3h 45m
2026-06-13 UAL543 SFO → SLC Jun 13, 23:40 UTCJun 14, 00:52 UTC1h 12m
2026-06-13 UAL543 SFO → SLC Jun 13, 23:30 UTCJun 14, 00:55 UTC1h 25m
2026-06-13 UAL1453 BUR → SFO Jun 13, 20:55 UTCJun 13, 21:50 UTC55m
2026-06-13 UAL2154 DEN → BUR Jun 13, 17:37 UTCJun 13, 19:30 UTC1h 53m
2026-06-13 UAL2154 DEN → BUR Jun 13, 17:30 UTCJun 13, 19:35 UTC2h 5m
2026-06-13 UAL1235 DEN → DFW Jun 13, 13:05 UTCJun 13, 15:50 UTC2h 45m
2026-06-13 UAL1134 EWR → CUN Jun 13, 00:25 UTCJun 13, 02:25 UTC2h 0m
2026-06-12 UAL314 DEN → EWR Jun 12, 20:05 UTCJun 12, 23:05 UTC3h 0m
2026-06-12 UAL1540 SJO → EWR Jun 12, 16:20 UTCJun 12, 18:40 UTC2h 20m
2026-06-12 UAL1540 SJO → EWR Jun 12, 16:01 UTCJun 12, 18:38 UTC2h 37m
2026-06-12 UAL2381 MSY → IAD Jun 12, 12:45 UTCJun 12, 14:25 UTC1h 40m
2026-06-12 UAL1913 IAH → LAS Jun 12, 02:35 UTCJun 12, 04:25 UTC1h 50m
2026-06-11 UAL568 IAH → SFO Jun 11, 22:05 UTCJun 12, 01:15 UTC3h 11m
2026-06-11 UAL1874 SFO → IND Jun 11, 17:25 UTCJun 11, 20:15 UTC2h 50m
2026-06-11 UAL1874 SFO → IND Jun 11, 16:46 UTCJun 11, 20:07 UTC3h 21m
2026-06-10 UAL439 EWR → GRR Jun 10, 23:50 UTCJun 11, 02:05 UTC2h 15m
2026-06-10 UAL1711 SFO → CLE Jun 10, 22:25 UTCJun 10, 22:50 UTC25m
2026-06-10 UAL2079 SFO → BOS Jun 10, 15:05 UTCJun 10, 19:30 UTC4h 25m
2026-06-10 UAL2744 MCO → EWR Jun 10, 12:15 UTCJun 10, 13:15 UTC1h 0m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N833UA page for operator, model, and routing details .

Mode-S AB6542 frequently asked

What is Mode-S code AB6542?
AB6542 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N833UA.
Where is Mode-S AB6542 registered?
Mode-S code AB6542 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is AB6542 broadcasting right now?
No active broadcast right now. Last signal was 14d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB6542, octal 52662502, decimal 11,232,578.
What flights does AB6542 operate?
Mode-S AB6542 has broadcast 20 distinct callsigns, including UAL581, UAL1874, UAL568, UAL1235, UAL1836.